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                警察局                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>
<div>很久很久以前，朕拥有着S国的全部领土。S国由N个城市组成，而且某些城市有道路相连。不过，由于马车相向而行是非常危险的，所以道路都修成单向的。</div>
<div></div>
<div>朕决定在S国的若干不同城市设置警察局。不过由于特殊经济原因，朕只能建立恰好K个警察局。朕建立的警察局必须符合如下条件：</div>
<div></div>
<div>1、从每个没有警察局的城市出发，都能达到某个有警察局的城市。</div>
<div></div>
<div>2、任意城市一旦发生危险，总有警察局能够派出人员到达那个城市。</div>
<div></div>
<div>朕想知道一共有多少种不同的方案设置警察局（话说朕**是闲的么。。。）</div>
<div></div>
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<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>
<p class="MsoNormal" style="text-indent:21.0pt;mso-layout-grid-align:none;
text-autospace:none"></p>
<div>每个测试点包含多组数据。</div>
<div></div>
<div>输入数据的第一行为C，为数据个数。</div>
<div></div>
<div>每组数据的第一行为N、M和K，代表了城市的个数、道路的个数以及建设的警察局数。以后M行，每行两个整数i、j，表示有一条从i城市到j城市的道路。输入数据没有重复道路。</div>
</div>
<p></p></p><hr/><h3>输出格式</h3><p><div></div>
<div>对每组数据输出一行，为建立K个警察局的不同方案数。</div>
<p></p></p><hr/><h3>样例输入</h3><pre>2
3 2 2
1 2
2 3
4 4 2
1 2
2 3
3 4
3 1

</pre><hr/><h3>样例输出</h3><pre>1
</pre><hr/><h3>提示</h3><p><p></p>
<div>对于100%的数据，有1&lt;=N&lt;=100，1&lt;=M&lt;=20000，1&lt;=K&lt;=N，1&lt;=C&lt;=1400</div>
<div>Notice:此题从前那个加重复了，因而换成现在这个题，不好意思，浪费大家的提交了。</div>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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